Plastidial targeting peptide

An isolated polynucleotide encoding an intraplastid-targeting polypeptide, wherein the polypeptide consists of:

• domain A consisting of:
• i) amino acids 60-100 of SEQ ID NO:
• 1;
• or ii) a fragment of a protein of an inner membrane of a chloroplast envelope, said protein being recognized by an antibody directed against SEQ ID NO:
• 1, and said fragment having at least 70% identity with amino acids 60-100 of SEQ ID NO:
• 1 or SEQ ID NO:
• 3 and when combined with domain B has plastid targeting activity;
• and
• a domain B located at the N-terminal end of domain A consisting of iii) a fragment of amino acids 1-59 of SEQ ID NO:
• 1, said fragment including at least amino acids 49-59 of SEQ ID NO:
• 1 or SEQ ID NO:
• 3, or iv) a fragment of a protein of an inner membrane of a chloroplast envelope, said protein being recognized by antibodies directed against the polypeptide SEQ ID NO:
• 1, and said fragment having at least 60% identity with said fragment iii) and when combined with domain A has plastid targeting activity.